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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94307d3953e34be38a1f45c97d3fd40ff39ed1ab05bd95fe8d678fa892510d3' 
  AND token = '/x3uxU8bwqC4Ug8PIffdJh376DI7XGLE861bnqV6WBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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