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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5e9077381db0f75c43cb26beb58af005a5dfba687c88c3945ea6101fa14528' 
  AND token = 'T8VsNeW34u6RL86XQjoBv9Z9dXzixkoWAzJWnJ9xQXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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