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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14231ad55c5721ca7b32c5bf0bf66cabb2daefdd52ead7591c3b0e8ae3ed0f9' 
  AND token = 'r7jEAt7utpLogKF6i8uyn4yk7LFP9doAs4oG1X3CFYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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