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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92fdb1f677fb7ac718105e1138cfda089cf8d1b54553f35dc3eb24ccfbdce81' 
  AND token = 'vDHe8ZnwraTm7XWeTKJU6ceID9vA7z4JpDEWpFe7vmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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