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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e2fc6f6e489b27307c1e8e1eb679f8c7042d2b9661ef1ed3d6a1fe53d6bb27' 
  AND token = 'l5cJs2neOoDf7D/YnA9oqgFv8Wb3aEo4jAH1w7phmZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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