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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545661bf32b37fc6e244312a3a94b596e889a2f19dbeaa58bbef92aa829b8613' 
  AND token = 'E2aXP1h8yJuNuVWWX720N6r6DbEXYtHRqpkeJjeinKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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