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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b76e91c3f3c96b52ae3ee1a4f2a4f3ee28653596c328c323eca8ab12399684' 
  AND token = 'uviRImOT4pE0wfeLJvW79ItqbjPFyNSkZv35esLq2rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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