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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f457ea3ccdb3078b8e37c62610635d69f4b01956b75883c021d98ea70d3bd92' 
  AND token = 'DKyS/TKKZR+xB10hDT8bu+iiSlI6EwUfD++ZascVyT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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