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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5badcb1ff173041b3846cfb6423a26e873daaf86064388ac659d7b44cb4fe6bd' 
  AND token = '0AaHbSG2/mCl3CsNrUzY6Smlw+c7Dy4uAEJTAaQkeSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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