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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6f0314d64dbdd66804de39934142b4717faf3a8454150efdd819ad8bac6e64' 
  AND token = 'ae0+725OkrjweTP88s2gfFlG7Inm9eg0Tp7dQEs3MdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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