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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b699250dafc1191123e7a83848596b68066de04e7af3b4fef5b30c7d74ec7d28' 
  AND token = 'PFCGW1b33NV2bo6VQ6R1tAGULUAZJKh3J2WcanooYr8=' 
  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"
    }
  }
}