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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fa175dec5964152cf91ee84f5498d4ba925d1cef19d8e82a902b1f541e9533' 
  AND token = 'f54GlZ1nIeKmwv6d9MdM+P7N+vIyMoDa/SRNG6XE7HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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