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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c36874d06643ef5fa5bc7bbd7d6af111eafc9e98a89a5051ae2b5237ff253af' 
  AND token = '3rzn0m0gMvukPjSs5qfBH2553hYsJSOfRuh65Leq9Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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