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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa805257028c516764edb67374fb64493d14ce240c1f8e0a38669b2bb769f6f' 
  AND token = '3N4fK1+1b5pabyQzLGaAtRYp6OYNm7+mZw2Gv3P7x38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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