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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b3e954c7c4ef8c52a6bcd0eddcfabcc7cea12a0297374573d4eda0d92d4da6' 
  AND token = 'vzM9zw14xjtClfhT7XU7vOgqAaFK998+cs+Bva0AuJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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