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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7195dce7b8585ab364457fb2f9971fec4a3b291e1df49595cc96ea29afd5f8e3' 
  AND token = 'Hb2fGrwSH2KxG+4cDyDLi2uo4ZNTL4IBIuAKCpXFEWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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