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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73134f65d0a46e70b4dbaf9d25388399af6ae33d023b906f62cdad1704b254f3' 
  AND token = '+EdkcSG1KrVGGuOoFA4Ba+T5G+SmSp7jkTcgtvF7M+o=' 
  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"
    }
  }
}