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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e80c3ccfdc8025bf56b670988650b4be927b4777eda3eba030f9cdbfba7fa5' 
  AND token = 'lJoLbdzfS/Ez2FSWkDg26XbL7tm9E/FbfCqgLt4Ny0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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