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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff96a4b3fcde6e7de5df0cf4deaa833592bb3c9d38b32317593c2a87e4d6fcc7' 
  AND token = 'Seug/peTSGynH5nNVT/RX/pZ62r5dqQgRa/6ISYqo7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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