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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c375530f34594135efac343696a5399508b81b0d3745b1a441199fa395dbeb' 
  AND token = 'tpN8agUW/VK6xd70xN+G+fkFWpKFYavaKeKI4+LLVuQ=' 
  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"
    }
  }
}