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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662e6c325c2a84b832498b9b464ba556e59f5bffa6d530f01c47968cd65c1c76' 
  AND token = '4eW30DgprzTiY4gKkMjdkstR72KcXaGwgmLJBkAyih0=' 
  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"
    }
  }
}