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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c3ea85584c0d63a76aceb8e5c3e7289bd8426db1a25ee31ddb4758ec4b0bcd' 
  AND token = '6pgE5u8If5zTg2Lb+IXypb43d34/WfhVsHz+QUsxB8c=' 
  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"
    }
  }
}