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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f4cadcaec3c8fb88e60810094199b04e6817fb0d25153c53ab191167ea05c4' 
  AND token = 'N7PHEW8FOWyJJavJ4LU0ylGw9ua5EENJfyTTWWPmqZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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