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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0ab700328837f397ef441c3492f9a7a10cd73c9b6821d2186940f7845491c8' 
  AND token = 'B5HDgVwL8/I5/0ORdMtktD8Mk31x+N6a4fRZCJdJtJk=' 
  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"
    }
  }
}