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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679bd8652d349be304301c4b626701d707ce13750bcb7d285de8c16f72bf30c9' 
  AND token = 'F30Q2Zh/67zJJnV3iajd0IAMTtb8EqUDXksPcSHN700=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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