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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b125071f96ea76813a7d22df814a8fecc31ed14c5fe773a48003351ef33dca6' 
  AND token = 'JAgNzGMqPLjvCbY8i8DuaGNlGySPLqF3cKPEIrbXPMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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