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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa47fa880571224310daac6bb43762ec6e085f68731711bed81a3c9e305a522' 
  AND token = 'p/u56ExLtAuTN+y6M5j67gc0ttv2DFw7idbUn5YIXfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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