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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536e275b035bc19afa8626b614019d6b8608911c68ff22bd430a3bac6ab58d34' 
  AND token = 'soV2EOJp6F9DOuuY8aB/R0xfevGjSNG0WFyHUc5PRlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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