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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9051a17f0fcc1e35738574c4b526d4e8e7bc01e920b9a62cc4dce99b974f63' 
  AND token = 'MhFOujoLDiIim1wQFMPRXhEe3m8M/QVU6TMkDlXq5ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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