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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eabad0287e0e5f8a875911e7fccc3c671c902f73de13e78344c12345a8e526b' 
  AND token = 'cCP5jToiiCrvwI2dPmv8ebeHADOv5MNWtXHvu1dKyiM=' 
  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"
    }
  }
}