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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936ca2ac385e8e218827b6d5d11e0960c36a618a7da50f0cb59c9e96bee25613' 
  AND token = 'Cmy35/fdYEdrCnDjQ+WjQpfUYHhwXDHf0HmlC93mfzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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