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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88780e889ee2abaa14c810473d786f06030e08acd276781a41c6568643c5d48' 
  AND token = '38CNhcM10hPG02dx+IVrJwiump15IMy8wwzfpzQ7Rok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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