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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb5b7c982c67a70e64059947c6ba75e0517a3120767484e2550812d3fd8715a' 
  AND token = 'KESJHtKiBC96JRidBIKU9F7Gc2DdbLT5w29qhD4kSrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}