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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b0d3a4d3f2e944d93c9c3714067e13852482df8696799a0eb0412fdd98ba0f' 
  AND token = '46llJkXbD1PZ9aom+SH5aQ3878iCp7ju/GQ9P3+wKww=' 
  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"
    }
  }
}