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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8d8514e165be0901d785bc424406dcd9ef59f30831986e373f42d57b996a3f' 
  AND token = 'UECU76p7pcoPAuCca0YynHRHLurTMaDXzgt16NnFQbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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