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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b0a046874a6d87b8d0d30b2cf4fc7a79d56cdab202fa0a7233f50e88341ebd' 
  AND token = '4T4nsn3mB6c5F/pxvfWuzIDbvt8igv+Keb3/GUWBzfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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