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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a79a5bb582a77fb602621bf7831ffb75d94e4709d0eafa80a9c538ef717ad2' 
  AND token = '1GEfMG+2juYvqa4WQ+dlI1b4QkdVEbMpu1IiMU+o3w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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