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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facddb0b465949abd4cbb7893336131583e2baf965611994df949d40bb6ad862' 
  AND token = 'Xhd5z5Ofebo6Xvmya/dA9BzPVuH6tzuiSg8NtPBApB4=' 
  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"
    }
  }
}