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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb72e19f1d1c906d6a741f0d11f9e52bdf9222cdffa5e617ba245ca289b45d64' 
  AND token = '3kbFNFOrYuv4H8/aFLex7Hy3Nh/bpzBAAlN3t/gezac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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