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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5a08907e3883b14a9f956f012451f5f80af3d4a63a5730dbab4612f8c960c9' 
  AND token = '3jpRhvkAtGZJ7HHCpIImoRMu+wrudD2mlckNya0c+jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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