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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0e241eb8226ea42e9dd437ba1ae650c5454a8f60d7a63c1a8cba307ca3cfc7' 
  AND token = 'HHYe5uHt1E4WamPMRNdrt2cxOP645rj3cLgm1W5ydvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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