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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8bf97098d5ef62b6586876f52461200c6f17c7103727b5b9bae2d04f6bfede' 
  AND token = '++Hsla+Ehk4f2GeiF4k3j1F0tsyhRUUX8VJIOSXrg9o=' 
  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"
    }
  }
}