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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661974ffe0af2094ee46f3f74bdfe3f309fc29691029d6402c3e7e32797f4d77' 
  AND token = 'nlukuH8fA5UBA0U3qa27qtocVDGCyxPJdFvhClZnTRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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