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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ae944e2738970471d757695df46c66c394610dfe57aa2f2d59216aec6defb2' 
  AND token = 'vkn3xkz4NM37+pkMk1prB2dP4CkGSjCmvFe1J1Zt6ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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