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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee999c16bd5da455981bb3a0c66537d02cc507296e255341d1c18c4c08d73d07' 
  AND token = 'NPER+Pt1qZ5D4lcDndb1K94INDQnD3Z6/GHwmSIBvn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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