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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5c39ab4193df4e3de8e7183f0a9e9446e2350a841882dec1fdee704f563c9a' 
  AND token = 'aL9UbgBrXxlsuxiYg4rJkUWV+bA07jfEmChVgC8AGFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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